Title line...Re: Reflector: EZ-Poxy Hardener

Jorge Bujanda jbujanda at dslextreme.com
Sat Nov 12 11:58:33 CST 2005


Oh!   Is it only me that does it?  I'm sorry.
I APOLOGIZE
Jorge



Jeffrey Clough wrote:

>Pleeze change subject  title if topic changes
> THANX   JC
>
>Jorge Bujanda wrote:
>
>  
>
>>Yup.
>>Very annoying, no doubt about it. But keeps you on your toes and once
>>you get proficient... you probably can handle almost any kind of wind.
>>I guess you really sharpen your crabbing and crosswind landings around
>>here... and learn to tighten your seatbelts more too. You should fly
>>this way more often though.
>>Regards
>>Jorge
>>
>>
>>steve korney wrote:
>>
>>    
>>
>>>Jorge...
>>>
>>>It might be VFR 360 days a year, but don't forget to mention the
>>>wind........
>>>
>>>Best... Steve
>>>
>>>
>>>
>>>----Original Message Follows----
>>>From: Jorge Bujanda <jbujanda at dslextreme.com>
>>>Reply-To: Velocity Aircraft Owners and Builders list
>>><reflector at tvbf.org>
>>>To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
>>>Subject: Re: Reflector: EZ-Poxy Hardener
>>>Date: Fri, 11 Nov 2005 12:17:40 -0800
>>>
>>>Thanks for the info Al.
>>>My epoxy box temperature varies 10 to 12 degrees (or more) because I
>>>have a difference of 30 to 35 degrees between day and night. My
>>>garage room temperatures may go from the 100s to the 60s in a summer
>>>day and 50s to the 20s in a winter day. Also, relative humidity may
>>>vary 60 - 70% in 24 hours. Today, 95% at 4:00AM and 22% at 1:00PM.
>>>Normally, it is very low here (desert). This doesn't help with the
>>>hardener clogging the dispensing tubes. Just a nightmare to deal with
>>>liquids here... but there are some good things too... like an annual
>>>average of 360 days VFR conditions. No wonder they chose Edwards Air
>>>Force Base as one of the prime locations for testing :-)
>>>Plan:
>>>Further insulate the box to maintain a lower and more stable
>>>temperature.
>>>Less material in the pumps
>>>Cap the dispensing tubes.
>>>Insulate the pump containers from the heatgun and heat dispensing
>>>tubes every day, before use.
>>>Heat new material before filling pump.
>>>
>>>Let's see how this works. Thanks again.
>>>
>>>
>>>
>>>Al Gietzen wrote:
>>>
>>>      
>>>
>>>>I used my epoxy pump from early 1997 until just recently when I
>>>>emptied it and flushed it with acetone because I expected to need it
>>>>no more. During that 8 year period I never had to clean it, and it
>>>>worked reliably.
>>>>
>>>>Other than when I was adding material to the pump, I would keep it
>>>>sealed and at room temp. I had hardener in the containers for more
>>>>than 2 years at times, and as near as I could tell by my qualitative
>>>>‘pull’ tests on samples the cured strength was fine.
>>>>
>>>>What worked for me was keeping the pump at a moderate temp, say
>>>>about 70 F, and maintain the temp as constant as you can. Lower temp
>>>>means less rapid loss of volatile components, and less oxidation of
>>>>components. A constant temp minimizes the moisture entering the pump
>>>>containers. I tried to keep the amount of material in the pump
>>>>containers to what I expected to use in a few days to a week.
>>>>
>>>>If the pump had not been used for a period of time (and there may
>>>>have been times as long as a year), and the hardener was getting
>>>>stiff, or the resin plating out some of the ‘white’ stuff, I would
>>>>heat the new materials in cans to about 105 -115 F before adding to
>>>>the pump containers; then heat the pump cylinders with a heat gun
>>>>until they were nice and warm to the touch; stir the materials in
>>>>the containers, and pump a few strokes through the pump. The warm
>>>>material would dissolve the crystals, and was a good ‘flush’ for the
>>>>pump.
>>>>
>>>>It worked for me; your results may vary.
>>>>
>>>>Al
>>>>
>>>>-----Original Message-----
>>>>From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org]
>>>>On Behalf Of Jorge Bujanda
>>>>Sent: Friday, November 11, 2005 6:16 AM
>>>>To: Velocity Builder's Forum. Reflector
>>>>Subject: Reflector: EZ-Poxy Hardener
>>>>
>>>>I've noticed that the EZ-Poxy hardener becomes grumous at the bottom of
>>>>
>>>>the container in the pump, even though the inside of the epoxy box
>>>>
>>>>maintains between 80 (night) and 90 (day) degrees. These grumes tend to
>>>>
>>>>dissolve with increased temperature and specially with stirring. The
>>>>
>>>>problem is, I need to unclog the pump, and go through the
>>>>
>>>>heating/stirring process almost every day. I have kept two unopened
>>>>
>>>>bottles inside the house since I got them with the kit and found they
>>>>
>>>>were in the same condition.
>>>>
>>>>If I expose the bottles to early morning sun to dissolve, will this
>>>>
>>>>damage the hardener? Is the hardener already bad and what is the
>>>>
>>>>cause? If I get rid of it, how do I keep this from happening to the
>>>>
>>>>new one?
>>>>
>>>>I welcome your comments. Thanks
>>>>
>>>>Regards,
>>>>
>>>>Jorge Bujanda
>>>>
>>>>XL FG (under construction)
>>>>
>>>>Palmdale, CA
>>>>
>>>>"Make your best case... not the best case."
>>>>
>>>>"Spare the noise... convince through silence."
>>>>
>>>>Website: http://members.dslextreme.com/users/jbujanda/
>>>>
>>>>_______________________________________________
>>>>
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>>>>------------------------------------------------------------------------
>>>>
>>>>
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>>>>        
>>>>
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>>>      
>>>
>>_______________________________________________
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>>    
>>
>_______________________________________________
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>
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